杏吧原创

In the search for extraterrestrial life, we look for planets at a similar distance from their sun as Earth is from ours: the so-called Goldilocks zone. However, we are very fortunate to have the bounty of materials that exists in Earth's crust, and our civilisation would not have developed without them. What are the odds of another planet being similarly equipped? It would need to have had a similar geological history to Earth's. Is this likely?

Environment

In the book, The Hitchhiker's Guide to the Galaxy, the Vogons demolished Earth. They said it would take approximately 2 minutes, so how much energy would they have needed to obliterate our planet? Would kicking the planet out of its orbit have been more energy efficient than simple destruction?

Technology

Earth

Humans